Investigators have named the pilot of the missing Malaysia Airlines Flight 370 as the “chief suspect” in the plane’s mysterious disappearance after clearing everyone else on board.

Malaysian detectives grew increasingly suspicious of the pilot after discovering that Capt. Zaharie Ahmad Shah programmed his flight simulator with a route that would land a plane on a small island in the Indian Ocean, the Sunday Times of London reports.

Shah had deleted the drills, but computer experts were able to recover them.

The official police investigation cleared all of the other 238 people on board the Boeing 777 that vanished on March 8.